Cast: Jung Kyoung-Ho, Jung Yu-Mi, Kim Sae-Ron
Synopsis: Su-cheol is a serial killer who uses the city sewers down a manhole as his secret hideout. Late one night, a young girl witnesses Su-cheol’s killing and he abducts her. Later her older sister, Yeon-seo, determined to find her lost sister, discovers the manhole and goes down. As Su-cheol’s blazing madness explodes due to the uninvited guest in his manhole, the two sisters stand against him in desperate attempts to escape out.